JP2000290888A - Opened pattern net for processing paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opened pattern net which can pattern paper with a proper suction force without requiring a large vacuum installation. SOLUTION: This opened pattern net for processing paper is obtained by incorporating a reinforcing net 3 for carriage with photo-sensitive resin-made opened patter structures 2, 2' in which many openings are formed, and has an air permeability of 50 to 350 cc/(cm2.sec). The thickness of the opened pattern structures 2 and 2' have 300 to 1,000 μm and 50 to 500 μm, respectively. The reinforcing net 3 for carriage has a unit opened portion area of 0.01 to 2 mm2, an opened portion area rate of 10 to 50%, an air permeability of 100 to 500 cc/(cm2.sec) and a tensile strength of >=20 kg/cm in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening pattern net for paper processing which is suitably used for producing bulky paper.

[0002]

2. Description of the Related Art
US Patent No. 45
No. 28239, Japanese Patent Publication No. 5-508449,
JP-T 5-508450 and JP-T 5-508
No. 452 is known. The aperture pattern nets described in these publications are a composite of an aperture pattern resin using a photosensitive resin and a conventionally used paper transport belt. In order to form an opening pattern using the technology described in these publications, a photosensitive resin is applied to one or both surfaces of the papermaking belt, and a mask corresponding to the opening pattern is applied to one surface of the applied resin. A step of arranging a film, irradiating the photosensitive resin with light such as ultraviolet rays through the mask film to cause a photoreaction, and removing the unreacted photosensitive resin with a developer such as water is performed.

In US Pat. No. 4,528,239,
A photosensitive resin is applied on one side of a papermaking conveyor belt on a smooth forming table, and a mask film corresponding to an opening pattern is arranged on one side of the applied resin, and is photo-cured by ultraviolet light or the like, and is cured on the back side (paper forming). An opening pattern net in which the surface opposite to the paper surface is macroscopically smooth is disclosed.
However, since the resin is applied only from one side, a part of the paper transport belt (projection at the intersection) is partially exposed, and such an aperture pattern net is composed of an aperture pattern structure and papermaking. The adhesive strength of the conveyor belt is weak, and when washing with high-pressure water or high-pressure air during long hours of operation, part of the aperture pattern structure peels off from the conveyor belt,
There was a drop.

On the other hand, Japanese Patent Application Laid-Open No. 5-508449, Japanese Patent Application Laid-Open No. 5-508450, and Japanese Patent Application Laid-Open No. 5-508452.
In the publication, a photosensitive resin is applied to both surfaces of a papermaking conveyor belt, and a deformable molding surface, a molding surface having irregularities, or a papermaking material having a light-impermeable filament is formed on the back side (the opposite side to the papermaking surface). An opening pattern net having an uneven surface on the rear surface side by applying a conveyor belt is disclosed. These techniques hold the pulp sheet in a wet state on the front side of the aperture pattern net, suck it from the back side, and make the fibers penetrate into the apertures of the aperture pattern net to perform patterning. It is an object of the present invention to solve the problem that a pinhole is generated in a part of paper manufactured because a part of the fiber passes through the aperture pattern net. Another object of the present invention is to remove fibers deposited on the surface of a vacuum dehydrator for suction by scraping off the uneven surface on the back side of the opening pattern net. However, in order to perform the above-mentioned patterning with an opening pattern net having an uneven shape on the back surface, a very large suction force is required, and a large-capacity vacuum device must be provided. In addition, the friction between the irregularities on the back side of the opening pattern net and the surface of the vacuum dehydrator is very large, and the opening pattern structure on the back side peels off and falls off due to the friction. The adhesive strength was weakened, and a part of the opening pattern structure on the surface side of the opening pattern net sometimes peeled off and dropped off from the transport belt in the same manner as described above.

[0005] Therefore, the present invention does not require a large vacuum equipment, can perform patterning with an appropriate suction force, and can open holes even when cleaning with high-pressure water or high-pressure air during long-term operation. An object of the present invention is to provide a durable aperture pattern net for paper processing in which a pattern structure does not peel off or fall off.

[0006]

According to the present invention, there is provided a reinforcing net for transport, and an aperture pattern structure made of a photosensitive resin, which is provided on both surfaces of the transport reinforcing net and has a large number of apertures. Being integrated, 50-350cc / (cm ² · s
ec) an opening pattern net for paper processing having an air permeability of ec), wherein the thickness of the opening pattern structure disposed on one surface of the reinforcing reinforcing net is 300 to 1000 μm, and the other surface has The thickness of the aperture pattern structure provided is 50 to 500 μm, and the reinforcing net for conveyance has one aperture area of 0.01 to ² mm ² , an aperture area ratio of 10 to 50%, Air permeability is 100-500cc /
(Cm ² · sec), tensile strength in the longitudinal direction is 20 kg /
The above object has been achieved by providing an apertured pattern net for paper processing having a diameter of not less than 1 cm.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an aperture pattern net for paper processing according to the present invention (hereinafter simply referred to as aperture pattern net) will be described below with reference to the drawings. Here, FIG. 1 is a plan view showing a main part on one surface side in one embodiment of the aperture pattern net of the present invention, and FIG. 2 is a plan view showing the other surface side in one embodiment of the aperture pattern net of the present invention. FIG. 3 is a plan view showing a main part, and FIG.
FIG.

As shown in FIGS. 1 to 3, the opening pattern net 1 is composed of a transport reinforcing net 3 and opening pattern structures 2 and 2 ′ arranged on both sides of the transport reinforcing net 3. It is configured integrally. The opening pattern net 1
(1) It is used for producing bulky paper directly from papermaking raw materials, and (2) It is used for producing bulky paper by imparting bulkiness to paper once made. In either case, the surface that comes into contact with the pulp fiber sheet during use in the apertured pattern net 1 is referred to as the front surface, and the surface that does not come into contact with the sheet is referred to as the back surface. A sheet made of pulp fibers is a wet sheet-like material (fiber sheet 1 to be described later) formed from papermaking raw materials and formed by depositing pulp fibers.
0), and a sheet-like material that has been wetted once made.

Each of the aperture pattern structures 2, 2 'is made of a photosensitive resin, and a continuous mesh pattern is formed over the entire surface thereof. The aperture pattern structure 2 disposed on one surface of the transport reinforcing net 3 is located on the front side when the aperture pattern net 1 is used, and the surface of the aperture pattern structure 2 is formed from the pulp fiber described above. Comes into contact with the sheet. On the other hand, the aperture pattern structure 2 ′ arranged on the other surface of the transport reinforcing net 3 is on the back side when the aperture pattern net 1 is used. Hereinafter, for the sake of simplicity, the opening pattern structure 2 is referred to as a front-side opening pattern structure, and the opening pattern structure 2 ′ is referred to as a back-side opening pattern structure.

A large number of square openings 21 are formed in the opening pattern structure 2 on the front side. The thickness T ₁ of the opening pattern structure 2 on the front side (see FIG. 3), in other words, the depth of the opening 21 on the front side is 300 to 1000 μm, preferably 400 to 800 μm, and 500
It is more preferable that the thickness be from 700 to 700 μm. The thickness is 3
If it is less than 00 μm, the penetration (deflection) of the fibers into the openings 21 is not sufficient, and it is not possible to form low-density projections in the obtained bulky paper. If it exceeds 1000 μm, the penetration (deflection) of the fibers becomes too large, and holes are easily formed in the bulky paper. As apparent from FIG. 3, the thickness T ₁ of the opening pattern structure 2 on the front side corresponds to the height from the outermost surface on the front side of the reinforcement net 3 for conveyance.

The opening pattern structure 2 'on the back side also has a square opening 2 like the opening pattern structure 2 on the front side.
Many 1's are formed. The thickness T ₂ of the opening pattern structure 2 ′ on the back side (see FIG. 3), in other words, the depth of the opening 21 ′ on the back side is 50 to 500 μm, and 70 to 4 μm.
The thickness is preferably 00 μm, and more preferably 100 to 300 μm. If the thickness is less than 50 μm, the strength of the integration of the aperture pattern structure 2 ′ and the reinforcing reinforcing net 3 is weak, and the aperture pattern net 1 is washed with high-pressure water or high-pressure air during long-term operation. In this case, a part of the opening pattern structure 2 ′ may peel off or fall off from the transport reinforcing net 3. Further, as the opening pattern structure 2 ′ peels off and falls off, the surface side opening pattern structure 2 may also peel off and fall off. On the other hand, 500 μm
The strength of integration with the reinforcing net for transport 3 does not increase so much even when the thickness exceeds the limit, and as described later, when the photosensitive resin layer is cured by irradiating ultraviolet rays or the like from the surface side, the thickness is large. In some cases, the photosensitive resin layer on the back side may not be sufficiently cured. Further, since the photosensitive resin generally has a property of expanding and becoming trapezoidal (trapezoidal) as the distance from the light source increases due to scattering of ultraviolet rays or the like, the thickness of the opening pattern structure 2 ′ on the back side is 500 μm. If it exceeds, the air permeability of the aperture pattern net 1 will be reduced. As apparent from FIG. 3, the thickness T ₂ of the opening pattern structure 2 'of the back side corresponds to the height from the outermost surface on the back side of the conveying reinforcing net 3.

The mesh patterns of the opening pattern structures 2 and 2 'on the front side and the back side of the opening pattern net 1 may have the same shape or different shapes.
In order to simplify the production and to increase the strength of integration with the transport reinforcing net 3, the same pattern is preferable.

FIGS. 4 to 6 show an example in which the mesh patterns of the opening pattern structures 2, 2 'on the front side and the back side of the opening pattern net 1 are different. More specifically, a large number of square openings 21 are formed in the opening pattern structure 2 on the front side, as in FIG. On the other hand, the opening pattern structure 2 ′ on the back side has a hexagonal opening 21 ′.
Are formed in large numbers. When different opening pattern structures 2 and 2 ′ are formed on the front and back of the transport reinforcing net 3,
Since the photosensitive resin layers on the front side and the back side are separately exposed, as shown in FIG.
The widths of the constituent members 23, 23 'constituting the 2' tend to be the largest at the portion in contact with the transport reinforcing net 3 and the smallest at the outermost portion. Therefore, in order to increase the thickness of the hole pattern structure 2 ′ on the back side and improve the air permeability of the hole pattern net 1, the hole pattern structures 2 and 2 ′ on the front side and the back side are required. It may be preferable that the shape of the opening is different.

In the case where the opening pattern structures 2, 2 'on the front side and the rear side have the same mesh pattern shape,
First, the transport reinforcing net 3 is placed on a smooth forming table on which a film is stuck, a predetermined amount of photosensitive resin is applied to the transport reinforcing net 3 one surface at a time, and dried to form a photosensitive resin layer. . Next, a mask film corresponding to the mesh pattern of the opening pattern structures 2, 2 'to be formed is disposed on the photosensitive resin layer on the front surface side, and the photosensitive resin layer is photo-cured through the mask film. Next, the unreacted photosensitive resin is removed with a developer such as water to form the target aperture pattern structures 2, 2 '. The opening pattern structures 2 and 2 'formed in this manner have the same mesh pattern on the front side and the back side of the opening pattern net 1, but as described above, the photosensitive pattern increases as the distance from the light source increases. When the light is irradiated from the front side, the width of the constituent members 23 and 23 ′ constituting the mesh pattern becomes larger on the back side when the light is irradiated from the front side. It is common.

On the other hand, when the mesh pattern of the opening pattern structures 2, 2 'on the front side and the back side is made different, first, a photosensitive resin is applied to one surface of the reinforcing net 3 for conveyance and dried. Then, a photosensitive resin layer on the surface side is formed. A mask film corresponding to the opening pattern structure 2 on the front side is disposed thereon, and the photosensitive resin layer is photo-cured through the mask film. Then, the unreacted photosensitive resin is removed by a developer such as water. Hole pattern structure 2 on the front side
To form Next, a photosensitive resin is applied to the other surface of the transport reinforcing net 3 and dried to form a photosensitive resin layer on the back surface side. A mask film corresponding to the opening pattern structure 2 ′ on the back side is disposed thereon, and the opening pattern structure 2 ′ on the back side is formed in the same manner as described above. In this case, the area of one opening in the opening pattern structure 2 ′ on the back side is 1 area in the opening pattern structure 2 on the front side.
It is preferable that the area of the opening pattern net 1 be twice or more the area of one opening part in order to improve the air permeability of the opening pattern net 1.

In the present invention, the opening pattern net 1
The opening pattern structure 2 ′ having a thickness of 50 to 500 μm is integrated on the back side of the substrate, so that the cross-sectional shape of the outermost surface side of the opening pattern structure 2 ′ is basically the same as shown in FIGS. The pulp sheet is preferably smooth because the sealing property at the time of suction is improved.

In order to further improve the bonding strength between the transport reinforcing net 3 and the opening pattern structures 2 and 2 ', the rear side or both surfaces of the transport reinforcing net 3 are attached to the transport reinforcing net 3 It is preferable to use one that has been polished in the range of 1 to 30% with respect to the thickness (t).

At least one of the aperture pattern structures 2 and 2 'has a papermaking stability (easiness of peeling of a pulp fiber sheet after patterning on the aperture pattern net 1 and water resistance). It is preferably water-repellent from the surface. More preferably, at least one of the aperture pattern structures 2 and 2 ′ has a water repellency having a contact angle with water of 60 ° or more, particularly 75 ° or more. Therefore, when the material of the aperture pattern structures 2 and 2 ′ is hydrophilic, it is preferable that the surface thereof is coated with water repellent. Examples of the water-repellent coating treatment include a method of performing a surface treatment with a fluorine-based water-repellent resin, a urethane resin, or the like. By using the aperture pattern net 1 having such aperture pattern structures 2 and 2 ', the pulp sheet once adhered to the aperture pattern net 1 by patterning by suction is transferred to another conveyor belt. In this case, there is an effect that the pulp sheet is more easily peeled off from the apertured pattern net 1, and furthermore, the water resistance is improved, so that the swelling and deterioration of the resin is suppressed. It will be more suitable for operation.

The release property of the pulp sheet can also be improved by applying a release agent to the surface of the opening pattern structure 2 on the front side. Examples of the release agent to be used include a polyolefin-based release agent, a higher fatty acid-based release agent, and a mineral oil-based release agent. In addition, the contact angle was measured by CONTACT ANGLEMETE manufactured by Kyowa Interface Chemical Co., Ltd.
This value was obtained by quickly measuring 10 μl of water with a syringe at a temperature of 25 ° C. and a small sample plate (76 mm × 26 mm) of the aperture pattern structure using RCA-D.

The opening 21 in the opening pattern structure 2 on the front side has an area (defined by the opening area of the opening 21 on the outermost surface of the opening pattern structure 2) of 3 to 3.
25 mm ^2, particularly 4 to 10 mm ² are preferred. If the area is less than 3 mm ² , the penetration (deflection) of the fibers into the apertures 21 is small, and the low-density projections of the resulting bulky paper tend to be small. On the other hand, if it exceeds 25 mm ² , the area of the mesh-like high-density region formed in the bulky paper tends to be small.

The area of the aperture 21 is also related to the area ratio of the aperture in the aperture pattern structure 2. That is, even if the area of each of the apertures 21 is within the above range, a sufficiently bulky paper cannot be manufactured unless a certain area of the apertures is obtained as the entire aperture pattern structure 2. Therefore, in the opening pattern structure 2 on the front side, the individual area of the opening 21 is set in the above range, and the area ratio of the opening 21 of the opening 21 on the outermost surface of the opening pattern structure 2. Is preferably 18 to 96%, particularly preferably 40 to 87%. If the opening area ratio is less than 18%, the area of the entire area where the low-density projections are formed in the obtained bulky paper becomes small, and it becomes difficult to obtain a bulky paper having a high absorption capacity and excellent texture. is there. If the opening area ratio exceeds 96%, the area of the entire area forming the mesh-like high-density area in the obtained bulky paper becomes small, and it tends to be difficult to obtain bulky paper having sufficient strength. The opening area ratio referred to in this specification refers to a value measured for a region where the opening 21 is formed in the opening pattern structure 2, for example, the opening 21 is not formed. The right and left sides of the opening pattern structure 2 are excluded from the measurement target area of the opening area ratio.

The area of the opening 21 is determined by the constituent material that forms (surrounds) the opening 21 in the opening pattern structure 2.
That is, it is related to the width of the constituent material 23 forming the mesh pattern. The width of the component material 23 on the outermost surface of the opening pattern structure 2 on the front side is 0.1 to 2 mm, particularly 0.2 to 1 mm.
mm is preferred. If the width is less than 0.1 mm, the line width of the network-like high-density region formed in the obtained bulky paper tends to be too narrow, and a bulky paper having sufficient strength tends to not be obtained. If it exceeds 2 mm, the line width of the network-like high-density region formed in the obtained bulky paper tends to be too large, resulting in a paper having a hard texture.

In the opening pattern structure 2 'on the back side, the area of one opening on the outermost surface is 2 to 900.
mm ² , particularly preferably ³ to 400 mm ² , from the viewpoint that the air permeability of the aperture pattern net 1 becomes good and the point that the adhesive strength between the aperture pattern structure 2 ′ and the reinforcing net for transport 3 is improved. . Further, the area ratio of the opening portion on the outermost surface is 17 to 97%, particularly 25 to 90%,
It is preferable from the viewpoint that the air permeability becomes good over the entire surface of the aperture pattern net 1 and that the adhesive strength between the aperture pattern structure 2 ′ and the reinforcing reinforcing net 3 is improved. For the same reason, the width of the component 23 ′ on its outermost surface is 0.2
It is preferably from 5 to 5 mm, especially from 0.3 to 4 mm.

As described above, the aperture pattern structures 2, 2 '
Is made of a photosensitive resin. As the photosensitive resin, for example, polyvinyl alcohol or unsaturated polyester, polyvinyl acetate, polyacrylamide or the like or a mixture thereof in which a photo-crosslinking agent is introduced into a polymer chain, or polyvinyl alcohol or an unsaturated resin in which a photo-crosslinking agent is simply mixed Examples include polyester, polyvinyl acetate, polyacrylamide, and the like, and mixtures thereof.

The transport reinforcing net 3 used integrally with the aperture pattern structure 2 has a large number of apertures 31 formed therein, and is used to increase the strength of the aperture pattern net 1. Things. For this purpose, the tensile strength in the longitudinal direction of the transport reinforcing net 3 is 20 kg /
cm or more, more preferably 40 kg / cm
That is all. The upper limit of the tensile strength is not particularly limited, and the higher the higher, the better. However, the upper limit is about 200 kg / cm in consideration of the constituent material of the transport reinforcing net 3 and the like. Tensile strength is determined from the measurement of the breaking strength using a tensile strength tester, the conditions are 10 mm width of the test piece,
The distance between the chucks is 100 mm, and the tensile speed is 60 mm / min.

The area of one opening 31 of the transport reinforcing net 3 is 0.01 to ² mm ² . If the area is less than 0.01 mm ² , it is not possible to obtain a sufficient flow rate of air through which the fibers are inserted (deflected) into the openings 21 of the opening pattern structure 2 on the front side by suction. . If the area of the opening 31 exceeds 2 mm ² , sufficient strength as a transport reinforcing belt cannot be obtained. To prevent pitting of effectively in lower density protruding portion of the bulky obtained sheet, it is preferable to the area 0.02～1Mm ^2, especially 0.03 to 0.3 mm ^2.

The transport reinforcing net 3 has an opening area ratio of 10 to 50%. The open area ratio is 10%
If the air flow rate is less than the above range, it is impossible to obtain a uniform flow rate of air that is sufficient to cause fiber penetration (deflection) into the apertures 21 of the aperture pattern structure 2 over the entire pulp sheet. If it exceeds 50%, sufficient strength as a transport net cannot be obtained. In order to effectively prevent holes from being formed in the low-density projections in the obtained bulky paper, the area ratio of the holes is preferably 15 to 30%. Further, the transport reinforcing net 3 has a minimum width of 0.05 to 1 mm, particularly 0.1 mm when the component 33 is viewed in plan.
It is preferable that it is 1 to 0.3 mm.

As the transfer net 3, a mesh belt made of a linear woven fabric, which is used as a normal transfer belt for papermaking and processing, can be used. As the linear body, a synthetic resin filament, strand, yarn or the like having high strength is suitably used.

The reinforcing net 3 for transport is made of JIS L 10
Air permeability measured according to No. 18 is between 100 and 500 cc /
(Cm ² · sec) (hereinafter, the term “air permeability” refers to a value measured by this method). The air permeability of the reinforcing belt for conveyance 3 is 100 cc / (cm ² · se).
If c) is not satisfied, the flow rate of air that is sufficient to cause the penetration (deflection) of the fibers into the openings 21 of the opening pattern structure 2 on the front side cannot be obtained, and the flow rate is 500 cc / (cm ² · s).
Exceeding ec), the area of the opening 31 generally becomes large, and a hole is easily formed in a low-density projection portion in the obtained bulky paper. Air permeability is 200-400cc / (cm ² · s
ec) is preferred.

The perforated pattern net 1 composed of the perforated pattern structures 2 and 2 'and the reinforcing net 3 for transport has an air permeability of 50 to 350 cc / (cm ² · sec). The air permeability of the opening pattern net 1 is 50 cc /
If it is less than (cm ² · sec), a sufficient flow of air cannot be obtained to express the penetration (deflection) of the fibers into the apertures 21 of the aperture pattern structure 2 on the surface side, and 350 cc
// (cm ² · sec), generally the opening 21
, The hole tends to be formed in the low-density projection portion in the obtained bulky paper, and sufficient strength cannot be obtained. The air permeability is 70 to 300 cc / (cm ²
c) is preferred.

The aperture pattern net 1 is preferably manufactured by the method shown in FIG. First, the reinforcing net 3 for conveyance is placed on the smooth forming table 6 on which the film 5 is stuck, and the above-described photosensitive resin 4 is coated on the surface to be the front side [FIG. And drying in an oven or the like to form a photosensitive resin layer 4a on the front side [FIG.
(B)]. The photosensitive resin 4 is applied so that the thickness of the photosensitive resin layer 4a formed by drying is 300 to 1000 μm. Usually, the thickness after drying is slightly reduced with respect to the thickness before drying, so that the photosensitive resin 4 is applied in consideration of the reduction rate. Since the photosensitive resin before drying is in a liquid state and has a certain degree of fluidity, the coating of the photosensitive resin on one side of the transport reinforcing net 3 causes voids in the transport reinforcing net 3 to be formed. It is filled with the photosensitive resin.

Next, in order to improve the strength of integration between the transport reinforcing net 3 and the opening pattern structure 2 on the front side, the transport reinforcing net 3 should be provided on the surface to be the back side. 7 (b)], and dried by an oven or the like to form a photosensitive resin layer 4a ′ on the back side [FIG. 7 (c)]. ]. The photosensitive resin 4 ′ is applied so that the thickness of the photosensitive resin layer 4 a ′ formed by drying is 50 to 500 μm. Also in this case, like the photosensitive resin layer 4a on the front side, the thickness after drying is slightly lower than the thickness before drying.
The photosensitive resin 4 'is applied in consideration of the reduction rate. still,
The order of applying the photosensitive resins 4 and 4 ′ on both sides of the transport reinforcing net 3 does not matter. Optimal drying conditions for the coated photosensitive resins 4 and 4 'are applied depending on the type of photosensitive resin used and the coating thickness.

Next, as shown in FIG. 7D, the ultraviolet ray transmitting portion 71 made of a pattern corresponding to the constituent material 23 of the opening pattern structure 2 on the front side and the opening portion of the opening pattern structure 2 An exposure mask 7 having an ultraviolet opaque portion 72 corresponding to 21 is placed in close contact with the photosensitive resin layer 4a on the front surface side. Such an exposure mask can be easily manufactured by ordinary printing techniques.

Subsequently, as shown in FIG. 7 (e), ultraviolet light is irradiated from the ultraviolet light source 8 toward the exposure mask 7. As the ultraviolet rays, those suitable for a wavelength at which the photosensitive resin layers 4a and 4a 'can cause photocrosslinking and photopolymerization are used. Generally, ultraviolet rays of 330 to 450 nm are used. The ultraviolet rays are irradiated until the photoreaction of the photosensitive resin layers 4a and 4a 'is sufficiently completed. The irradiation time varies depending on the photosensitive resin used and the thickness of the photosensitive resin layer, but is generally about 1 to 5 hours. The photosensitive resin layer 4 located at a position facing the ultraviolet transmitting portion 71 in the exposure mask 7 by the irradiation of the ultraviolet light
a, 4a 'undergo a photoreaction and cure. The photoreaction of the photosensitive resin layers 4a and 4a 'is not limited to the ultraviolet irradiation surface,
Occurs throughout the thickness direction.

In order to form the opening pattern structures 2 and 2 ′ having different mesh patterns on the front and back of the transport reinforcing net 3, first, only the photosensitive surface of the transport reinforcing net 3 should be photosensitive. After the resin 4 is applied and dried to form the photosensitive resin layer 4a on the front side, exposure and development are performed by disposing an exposure mask thereon as described above. Next, the photosensitive resin is coated and dried on the surface to be the back side of the reinforcing net 3 for conveyance in the same manner, and the photosensitive resin layer 4a 'on the back side is formed.
Is formed, and an exposure mask having a pattern different from that of the exposure mask is disposed thereon to perform exposure and development.

After the photoreaction is completed, the exposure mask is removed,
The unreacted photosensitive resin, that is, the photosensitive resin located at a position opposite to the ultraviolet opaque portion 72 in the exposure mask 7 is removed. Specifically, as shown in FIG. 7 (f), the developer 9 'is sprayed toward the photosensitive resin layers 4a and 4a' by using the spray device 9 to scrape off the unreacted photosensitive resin. Thereby, the opening pattern structures 2 and 2 ′ integrated with the transport reinforcing net 3 can be manufactured [FIG.
(G)]. The most suitable developer is used depending on the photosensitive resin to be used. Generally, water, a dilute alkaline aqueous solution,
Alcohol and the like.

As a result of the removal of the unreacted photosensitive resin, the remaining (that is, the photoreacted) photosensitive resin is removed as shown in FIG.
23 ', the aperture pattern net 1 comprising the aperture pattern structures 2 and 2' having a predetermined mesh pattern and the transport reinforcing belt 3 is manufactured.

If necessary, the aperture pattern structures 2, 2 'in the aperture pattern net 1 obtained may be subjected to a water-repellent treatment. For example, a water-repellent resin is applied to the opening pattern structure 2 on the front side, and the excess water-repellent resin is suctioned off from the surface opposite to the coated surface to thereby remove the opening pattern structures 2 and 2 ′. Is also subjected to a water-repellent treatment.
It is preferable that the degree of water repellency of the opening pattern structures 2 and 2 ′ by the water repellency treatment is such that the contact angle with water is equal to or more than the above-described value. When the bulky paper described below is manufactured using the thus-obtained perforated pattern net 1, a large vacuum facility is not required, patterning can be performed with an appropriate suction force, and a long time can be obtained. There is an advantage over the conventional hole pattern net that the hole pattern structures 2, 2 'do not peel off or fall off even when cleaning is performed with high-pressure water or high-pressure air during operation.

Next, a preferred method for producing bulky paper using the thus-obtained perforated pattern net will be described with reference to FIG. Here, FIG. 8 is a schematic diagram showing an apparatus suitably used in the method for producing bulky paper using the apertured pattern net of the present invention. The production method described below is an example of a case where bulky paper is directly produced from papermaking raw materials, that is, an example of a case where an apertured pattern net is used for papermaking.

In the above method for producing bulky paper, the water content is set to 50 to 50 in the pattern applying step which is provided before the drying step and includes the suction section and the opening pattern net which circulates along the suction section. A 99% by weight fiber sheet is transferred, and the fiber sheet is suctioned while being held on the aperture pattern net, and the fiber sheet is patterned corresponding to the aperture pattern net. In which a bulky paper having an uneven pattern is obtained by drying.

An apparatus (paper machine) shown in FIG.
The apparatus 50 includes a raw material supply unit 100, a paper layer forming unit 200, and a pattern applying unit 30.
0, a drying section 400 and a winding section 500.

The raw material supply section 100 is provided with a papermaking raw material supply head 101, and a fiber suspension adjusted to a predetermined concentration is supplied from the papermaking raw material supply head 101 to the paper layer forming section 200. I have. The paper layer forming section 200
The apparatus includes a paper layer forming belt 201 and a dehydration suction box 202 provided adjacent to the paper layer forming belt 201. The paper layer forming belt 201 is formed of a wire mesh belt used in a normal paper machine. On the other hand, the suction box 202 is capable of dehydrating the fiber sheet 10 formed on the paper layer forming belt 201, and adjusts the moisture content of the fiber sheet 10 conveyed to the pattern applying section 300 which is a downstream process. are doing. Further, from the paper layer forming section 200 to the pattern applying section 300 and the drying section 400 described below, the transport pickup belt 203
Are running, and the fiber sheet 10 can be stably conveyed. The suction box 204 holds the paper layer forming belt 20.
Fiber sheet 1 from 1 to transport pickup belt 203
0 transfer.

The pattern applying section 300 is provided with a suction drum 304 and the above-described aperture pattern net 1 circulating along a part of the peripheral surface of the suction drum 304. As described above, the opening pattern net 1 is the transport reinforcing net 3
And the opening pattern structures 2 and 2 'arranged on both sides thereof are integrated. A suction box 307 is provided in the suction drum 304. The suction box 307 is disposed inside a portion where the opening pattern net 1 travels along the peripheral surface of the suction drum 304, whereby the air flows from the outside toward the inside through the opening pattern net 1. Is made possible. Also,
The pattern applying section 300 is provided with an air nozzle 308 and a weak suction box 309, which facilitate the transfer of the fiber sheet 10 stuck to the aperture pattern net 1 to the transport pickup belt 203.

The drying section 400 includes a drum-shaped through-air dryer 401. This dryer 40
In 1, the hot air passes from the outside to the inside of the drum peripheral surface. This dryer 401
A mesh net 402 is disposed on the peripheral surface of the mesh. As the mesh net 402, a net having an opening that does not hinder the passage of hot air is used. A suction box 403 is provided near the lower end inside the dryer 401, and the suction box 403 allows the fiber sheet 10 transferred from the pattern imparting unit 300 to move.
Are easy to transfer onto the mesh net 402. The winding section 500 includes a winder 501 for winding the manufactured bulky paper 11.

The method for producing bulky paper using the apparatus 50 shown in FIG. 8 will be further described. First, a fiber suspension is supplied from the papermaking raw material supply head 101 onto the paper layer forming belt 201, and Deposit the fibers on 201,
A wet fiber sheet (paper layer) 10 is formed.
The concentration of the fiber suspension is not particularly limited, and can be appropriately selected from a range in which the paper layer forming step can be stably performed.

Next, the moisture contained in the fiber sheet 10 is dehydrated by a suction box 202 as a suction device, and the water content of the fiber sheet 10 before being transferred to a patterning step as a downstream step is determined. It is a predetermined value. The moisture content is preferably 50 to 99% by weight of the fiber sheet 10, more preferably 65 to 90% by weight, and still more preferably in order to enable sufficient patterning of the fiber sheet 10 in the patterning step. Is 70-85% by weight
And If the water content is less than 50% by weight, the degree of freedom of each fiber in the wet fiber sheet 10 is low, so that it may be difficult to reconstruct the fiber structure by suction, and if it exceeds 99% by weight. The structure of the wet fiber sheet 10 cannot be maintained, and it may be difficult to convey the fiber sheet 10.

Fiber sheet 10 adjusted to a predetermined moisture content
Is separated from the paper layer forming belt 201 and transferred onto the opening pattern structure 2 on the front surface side of the opening pattern net 1. In the suction drum 304 installed on the inner periphery of the orbiting pattern net 1, air is sucked from the outside to the inside by the suction box 307 via the opening pattern net 1. Therefore, in the fiber sheet 10, a region located on the opening 21 in the opening pattern structure 2 on the front side (this region is referred to as “region A”) is, as shown in FIG. Due to the suction, the hole 21 penetrates into the opening 21 and has a convex shape whose thickness increases toward the inside of the suction box 307. The area A is a low fiber density area in which the fiber density of the constituent fibers is lower than before the suction. In this case, since the transport reinforcing net 3 which is finer than the aperture pattern structure 2 is provided below the aperture pattern structure 2, the area A
The sharp increase in the thickness (a sharp decrease in the density) in is controlled by the reinforcing belt 3 for conveyance, so that a large hole is not opened in the area A or the fiber sheet 10 is not broken.

On the other hand, the portion of the fiber sheet 10 which is located on the component material 23 of the opening pattern structure 2 on the front side and its vicinity (this region is referred to as “region B”) is formed by the suction. Since it is pressed against the material 23 and compressed, its thickness is slightly reduced and its fiber density is slightly increased as compared to before suction. That is, the area B is a high fiber density area relatively to the area A. Such a high fiber density region has an effect of suppressing the tendency of the tensile strength to decrease due to the low fiber density region in the obtained bulky paper. In particular, as described above, since the aperture pattern structure 2 is formed from a continuous mesh pattern, the high fiber density region also becomes a continuous mesh pattern, and the tensile strength of the obtained bulky paper is further improved.

In this way, while the hole pattern net 1 travels along a part of the peripheral surface of the suction drum 304,
The fiber sheet 10 is provided with a concavo-convex pattern corresponding to the mesh pattern of the opening pattern structure 2 on the front side.

The suction force of the suction box 307 in the pattern applying step depends on the basis weight and moisture content of the fiber sheet 10, but a general range is -10 to -100.
kPa, particularly preferably −25 to −70 kPa.

The fiber sheet 10 on which a predetermined pattern is formed in the pattern applying step is then introduced into a dryer 401 as a drying step, and is dried by passing through hot air. At this time, a consolidation step generally performed in a normal papermaking process is not performed. The reason for this is to prevent the bulkiness of the resulting bulky paper from being impaired.

The fiber sheet 10 is dried while the dryer 401 makes one rotation, and the bulky paper 11 as the final product is obtained. The obtained bulky paper 11 is wound by a winder 501 in the winding section 500.

In the above-described manufacturing method, the pattern applying step including the opening pattern net 1 and the suction drum 304 is provided before the drying step, so that the following method cannot be obtained by the conventional method for manufacturing bulky paper. There are advantages as described in (1) to (5). (1) Since it is possible to form an uneven pattern on the fiber sheet without guiding the opening pattern net 1 into the drying process,
An aperture pattern structure made of a non-heat-resistant material having the following softening point can be used. (2) Opening pattern net 1
Only makes a round along a part of the circumferential surface of the suction drum 304, so there is no need to manufacture a net that is long. (3)
The pattern shape applied to the fiber sheet 10 can be easily changed by a simple operation of merely replacing the opening pattern net 1. (4) Since the opening pattern net 1 is not guided into the drying process, it is hardly deteriorated even when used continuously for a long time.
Its service life is lengthened. (5) By moving the entire pattern imparting section 300 downward to remove the apertured pattern net 1 from the travel path of the fiber sheet 10, normal papermaking production can be facilitated, and switching to normal papermaking production is easy. is there.

FIG. 10 schematically shows the structure of the cross section of the bulky paper thus obtained. As shown in FIG. 10, the bulky paper 11 obtained by the above-described method has a low fiber density region 12
And a high fiber density region 13. The low fiber density region 12 is formed corresponding to the opening 21 in the opening pattern structure 2 on the front surface side, and has a relatively large thickness. On the other hand, the high fiber density region 13 is formed corresponding to the component material 23 surrounding the opening 21 in the opening pattern structure 2 on the front surface side, and has a relatively small thickness. As a result, the bulky paper 11 has an uneven structure, is extremely bulky, and has a large thickness. Therefore, it has high absorbency and excellent softness. Further, since the high fiber density region 13 having high strength has a continuous mesh pattern, the bulky paper 11 also has appropriate strength. Further, when a wet paper strength enhancer such as a polyamidoamine / epichlorohydrin resin which expresses wet strength is used, the bonding between the fibers is performed in a state having the uneven structure defined by the opening pattern structure 2. Since the adhesion occurs, the sheet has an excellent feature that its uneven shape is maintained even when wet.

As described above, the aperture pattern net and the method for manufacturing the same according to the present invention have been described based on the preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention. Changes are possible. For example, the opening pattern structure 2 of the opening pattern net 1
The shape of the opening portions 21 and 21 'in 2' may be rectangular, triangular, rhombic or circular, or a combination of these shapes in addition to the shape shown in FIG. Further, in the above description, a method of manufacturing a bulky paper using the apertured pattern net for papermaking has been described. However, instead of this, the apertured pattern net 1 is used for post-processing the paper once made. Bulk paper may be manufactured. That is,
Once the paper obtained by papermaking is wetted, a fiber sheet having a predetermined moisture content (preferably 50 to 99%) is formed into a fibrous sheet, and then a device is used in which an apertured pattern net circulates along a suction part. The fibrous sheet may be subjected to an uneven pattern to produce a bulky paper. Further, the apertured pattern net is not limited to being used in the above-described method for producing bulky paper, and may be used in other manufacturing methods, for example, the method for producing bulky paper described in JP-T-5-508449. .

[0056]

The following examples illustrate the effectiveness of the present invention. However, the scope of the present invention is not limited to such an embodiment. In the following examples, “%” is used.
Means "% by weight".

[Example 1] A vertical reinforcing net 9
A polyester 1,3 satin woven net of 1 mesh / inch × 56 mesh / inch was used. This transport reinforcement net has one open area 0.023 mm ² ,
20% open area ratio, 260 cc / (cm ² · s air permeability)
ec), strength in the longitudinal direction is 67 kg / cm, thickness 0.4
3 mm. This reinforcing net for transport is placed on a smooth forming table on which a film is attached, and a photosensitive resin liquid comprising a diazonium compound as a photocrosslinking agent and a mixture of vinyl acetate and polyvinyl alcohol on a surface to be made a surface. Was coated using a coating bar, and dried by far infrared rays to form a photosensitive resin layer having a thickness of 600 μm. Next, the same photosensitive resin liquid was applied using a coating bar on the surface to be turned into a back surface by turning over the transport reinforcing net, and then dried by far infrared rays to form a 100 μm thick photosensitive resin layer.

Next, as shown in FIG.
An exposure mask composed of a continuous pattern of squares as shown by. In this exposure mask, a continuous square pattern portion is an ultraviolet ray non-transmitting portion, and the other portions are ultraviolet ray transmitting portions. The opening area of one square pattern is 8m
m ² , and the line width of the pattern is 0.25 mm. The exposure mask was irradiated with ultraviolet light having a wavelength of 365 nm to photocrosslink the photosensitive resin located opposite to the ultraviolet light transmitting portion. After the photocrosslinking was completed, the exposure mask was removed, and water was sprayed onto the photosensitive resin using a high-pressure spray device to remove unreacted photosensitive resin, thereby forming an aperture pattern structure. Teflon resin is applied as a water-repellent resin on the surface side of the hole pattern net where the transport reinforcement net and the hole pattern structure are integrated, and the excess water-repellent resin is suction-removed from the opposite side of the coated surface and then dried. And subjected to a water-repellent treatment. Thus, the aperture pattern net shown in FIGS. 1 to 3 was obtained.
Table 1 shows the characteristic values of the obtained aperture pattern net.

[Embodiment 2] The reinforcing net for transportation is Embodiment 1
The same as above was used. In the same manner as in Example 1, the transport reinforcing net was placed on a smooth forming table to which a film was attached, and a diazonium compound as a photocrosslinking agent and a mixture of vinyl acetate and polyvinyl alcohol were placed on the surface to be used as the surface. Was applied using a coating bar, and dried by far infrared rays to form a photosensitive resin layer having a thickness of 600 μm. An exposure mask having a square continuous pattern similar to that of Example 1 was provided thereon, and photocrosslinking and development were performed as in Example 1 to form an opening pattern structure on the front surface side. Next, the same photosensitive resin liquid was applied to the surface to be used as the back surface using a coating bar, and then dried with far infrared rays to a thickness of 150 μm.
m of the photosensitive resin layer was formed. An exposure mask having a hexagonal continuous pattern as shown in FIG. 5 was disposed thereon. One opening area of the hexagonal pattern is 20 mm ² ,
The pattern line width is 0.25 mm. Thereafter, photocrosslinking and development were performed in the same manner as described above to form an aperture pattern structure having different mesh patterns on the front and back sides. Next, a water-repellent treatment was performed in the same manner as in Example 1 to obtain an aperture pattern net shown in FIGS. Table 1 shows the characteristic values of the obtained aperture pattern net.

Example 3 One side of the transport reinforcing net used in Example 1 was 5% of the thickness of the transport reinforcing net.
, And an apertured pattern net was manufactured in the same manner as in Example 1 except that the polished surface side was changed to the back surface side. Table 1 shows the characteristic values of the obtained aperture pattern net.

[Comparative Example 1] In Example 2, an aperture pattern net was obtained by subjecting the aperture pattern structure formed only on the front surface side to a water-repellent treatment. Table 1 shows the characteristic values.

[Comparative Example 2] A urethane resin was applied to the front and back of the apertured pattern net obtained by photocrosslinking and development in the same manner as in Example 1, and dried without removing excess urethane resin by suction. Thus, an apertured pattern net with reduced air permeability was obtained. Table 1 shows the characteristic values.

Comparative Example 3 The procedure of Example 1 was repeated, except that the thickness of the opening pattern structure on the front side was changed to 250 μm and the thickness of the opening pattern structure on the back side was changed to 30 μm. To obtain an opening pattern net. Table 1 shows the characteristic values.

Comparative Example 4 In Example 1, except that the thickness of the opening pattern structure on the front side was 1200 μm and the thickness of the opening pattern structure on the back side was 30 μm.
An apertured pattern net was obtained in the same manner as in Example 1. Table 1 shows the characteristic values.

[Production Example] Using the apertured pattern nets obtained in the above Examples and Comparative Examples, bulky paper was produced by the following method using the apparatus shown in FIG. That is, softwood bleached kraft pulp (weight average fiber length: 2.35 mm) 60% by weight and hardwood bleached kraft pulp (weight average fiber length:
0.74mm) Canadian Standard Freeness 64
Beated to 0 ml. A slurry obtained by dispersing the pulp raw material at 1% by weight was mixed with a polyamideamine-epichlorohydrin resin WS-570 (Japanese P.I.
MC) and 0.6% by weight (based on pulp weight), and 0% of carboxymethylcellulose (WS-A, manufactured by Daiichi Kogyo Seiyaku) as a dry paper strength enhancer and a yield enhancer for the polyamidoamine / epichlorohydrin resin. 0.25% by weight (based on pulp) was added to obtain a papermaking raw material.

Papermaking material supply head 1 of the papermaking machine shown in FIG.
From 01, the papermaking raw material was diluted to 0.1% by weight, supplied to a paper layer forming belt 201, and suction-dehydrated in a suction box 202 to form a fiber sheet 10 having a water content of 75% by weight. Next, the fiber sheet 10 is transferred to the opening pattern net 1 that circulates along a part of the peripheral surface of the suction drum 304, and the suction box 30 provided in the suction drum 304 is provided.
7 to obtain a predetermined concavo-convex pattern by suction at -46.5 kPa. The papermaking speed for producing bulky paper is 1
It was 50 m / min. The patterned fiber sheet 10 is transferred to the transport pickup belt 203 by the weak suction of the weak suction box 309 and
Introduced to 1. Fiber sheet 10 in dryer 401
Is dried by passing hot air of 250 ° C., and the basis weight is 22 g / m 2.
² bulky paper 11 was obtained.

In the production of bulky paper using the apertured pattern nets of the above Examples and Comparative Examples, peeling and dropping of the apertured pattern structure from the transport reinforcing net in the apertured pattern net during a continuous papermaking operation for 6 hours. The average dry thickness (under a load of 3 g / cm ² , 23 g / cm ²⁾ to examine the condition, the perforated condition of the bulky paper, the thickness and strength, and the absorbency of the bulky paper.
cm ² load), average wet thickness (3 g / cm ² load,
23g / cm ² load), dry tensile strength (MD, C
D), wet tensile strength (MD, CD), and saturated water absorption per unit area were measured by the following methods. Table 2 shows the results.
Shown in

<Peeling / dropping state of the aperture pattern structure from the transport reinforcement net in the aperture pattern net>
(Durability of perforated pattern net) Bulk paper was continuously manufactured for 6 hours, and it was observed whether peeling or falling off of the perforated pattern structure occurred on the front and back of the perforated pattern net, and evaluated according to the following criteria. did. A: No peeling or falling off was observed. ；: Peeling is observed in a very small part of the area of less than 10 cm ² . Δ: Peeling at several places or falling off at one or more places is observed with an area of less than 10 cm ² . ×: Peeling or falling off is observed in an area of 10 cm ² or more.

<Perforated state of manufactured bulky paper> The perforated state of the low density protrusion portion of the obtained bulky paper was observed. 1
A sample having a large hole except for a fine sample having a size of about ² mm was evaluated as x, and the others were evaluated as ○.

<Average Dry Thickness> Using a thickness gauge (R-5C) manufactured by Ozaki Seisakusho, 75 g of an acrylic plate having a bottom surface of 5 cm × 5 cm was placed on the obtained bulky paper. The average dry thickness under a load of 3 g / cm ² was measured.
Further, a 500 g weight was further placed on the acrylic plate, and the dry average thickness under a load of 23 g / cm ² was measured.

<Average Wet Thickness> The bulky paper is 7 cm × 7 cm.
After immersion in a large amount of water for 5 seconds, water was drained for 10 seconds, and the average wet thickness was measured in the same manner as in the case of the average dry thickness.

<Dry Tensile Strength> After cutting the bulky paper into strips having a width of 25 mm and a length of 100 mm, a tensile speed of 300 mm / mm was immediately measured using a universal compression tensile tester (RTM-25, manufactured by Orientic). The strength at break was measured under the conditions of a min. Table 2
In the figure, MD indicates the strength in the machine direction of the paper machine, and CD indicates the strength in the direction perpendicular thereto.

<Wet tensile strength> A bulky paper was cut into a strip having a width of 25 mm and a length of 100 mm, immersed in a large amount of water for 5 seconds, drained for 10 seconds, and then broken in the same manner as the dry tensile strength. The strength at the time was measured.

<Saturated Water Absorption> The bulky paper is 7 cm × 7 cm wide.
And immersed in a large amount of water for 20 seconds, drained the water for 30 seconds, and then weighed the water absorbed in the bulky paper (g / 49c).
m ² ) was measured with a balance.

[0075]

[Table 1]

[0076]

[Table 2]

As is clear from the results shown in Tables 1 and 2, the bulky papers (Examples 1 to 3) obtained by a specific method using a specific opening pattern net were compared with the papers of Comparative Examples. There is no perforation, the thickness is large, the absorbency is high,
And it turns out that it has moderate intensity. Also, it can be seen that the durability of the apertured pattern net is excellent.

[0078]

According to the present invention, if bulky paper is manufactured by using the opening pattern net for paper processing of the present invention, patterning can be performed with an appropriate suction force without requiring a large vacuum equipment. Further, according to the hole pattern net for paper processing of the present invention, even when washing with high-pressure water or high-pressure air during long-term operation, the hole pattern structure does not peel off or fall off, and the durability is low. improves.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part on one surface side in an embodiment of an aperture pattern net of the present invention.

FIG. 2 is a plan view showing a main part on the other surface side in one embodiment of the aperture pattern net of the present invention.

FIG. 3 is a sectional view taken along line II in FIGS. 1 and 2;

FIG. 4 is a plan view showing a main part on one surface side in another embodiment of the aperture pattern net of the present invention.

FIG. 5 is a plan view showing a main part on the other surface side in another embodiment of the aperture pattern net of the present invention.

FIG. 6 is a sectional view taken along line II in FIGS. 4 and 5;

FIG. 7 is a process chart showing a preferred method of manufacturing the apertured pattern net shown in FIGS. 1 to 3;

FIG. 8 is a schematic view showing an apparatus suitably used in the method for producing bulky paper using the perforated pattern net of the present invention.

FIG. 9 is an enlarged view of a main part showing a state of suction of a fiber sheet by a suction drum.

FIG. 10 is a schematic diagram showing a cross-sectional structure of bulky paper manufactured using the apertured pattern net of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Opening pattern net 2 Front opening pattern structure 2 ′ Back opening pattern structure 3 Conveying reinforcement net 4, 4 ′ Photosensitive resin 5 Film 6 Smooth forming table 7 Exposure mask 8 Ultraviolet light source 9 Spray device 9 'developer

Continued on the front page (72) Takashi Sakurai, Inventor 2606 Akabane, Kaigamachi, Haga-gun, Tochigi Pref. F-term (reference) 4L055 CE62 CE90 CE90 EA07 EA08 EA12 EA15 EA17 EA29 FA16

Claims (4)

[Claims] 1. A reinforcing net for conveyance and an aperture pattern structure made of a photosensitive resin and provided on both sides of the reinforcing net for conveyance and formed with a large number of apertures, are integrated.
An opening pattern net for paper processing having an air permeability of ３５０350 cc / (cm ² · sec), wherein the thickness of the opening pattern structure arranged on one surface of the transport reinforcing net is 300 to 1000 μm. And the thickness of the aperture pattern structure disposed on the other surface is 50
５００500 μm, and the reinforcing net for transportation has an opening area of 0.01
２2 mm ² , opening area ratio 10-50%, air permeability 1
An opening pattern net for paper processing having a tensile strength in the longitudinal direction of 00 to 500 cc / (cm ² · sec) and 20 kg / cm or more. 2. The patterning net according to claim 1, wherein at least one side of the reinforcing net for conveyance is polished. 3. The aperture pattern net for paper processing according to claim 1, wherein at least one of the aperture pattern structures has a water repellency having a contact angle with water of 60 ° or more. 4. The one hole pattern structure, wherein the area of one hole on the outermost surface of the hole pattern structure is 3 to 25 mm ² , the area ratio of the hole is 18 to 96%, and the pattern is formed. 2. The hole pattern net for paper processing according to claim 1, wherein the width of the constituent material is 0.1 to 2 mm.